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Old 05-07-2020, 12:21 AM   #1
Scooby Newbie
Member#: 511116
Join Date: Jan 2020
Default Subaru impreza humming from the back


Have an impreza base model that is humming from the back. Doesnt seem to be getting worse. Been this way since I bought it used so I don't know the full history. Loudest at 40-50mph. Quieter above and below those speeds. Turning doesn't change the consistency or sound. It's a steady humming, not a pulsing sound.

Rear diff fluid and atf fluid changed (genuine Subaru fluids and gear oil) with no improvement or worsening of the sound. Car has 105k miles.
Putting the automatic in neutral while coasting doesn't change the sound.

No uneven wear in the tires.

Any idea?


Last edited by zpmada; 05-07-2020 at 12:27 AM.
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Old 05-07-2020, 08:06 AM   #2
Scooby Newbie
Member#: 19843
Join Date: Jun 2002
Chapter/Region: MWSOC
Location: St. Louis
2000 2.5 RS Sedan
2016 Base 5MT VRP


even though you say turning doesn't change the sound, i'd probably replace the wheel bearings since it's a common problem for them to go bad

alignment and balance, make sure your rear differential bushings aren't cracked/broken... check the CV axles, maybe replace 'em...

hard to tell without seeing/hearing it in person... also really look around for anything rubbing on the underside..

good luck
Cujo31 is offline   Reply With Quote
Old 05-13-2020, 12:17 AM   #3
Scooby Newbie
Member#: 514709
Join Date: May 2020

Also check for tire cupping. Happened on my Mitsubishi, could not properly diagnose until dealer borrowed wheels from another car.
Salle071 is offline   Reply With Quote

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